자식 요소 필터 선택자
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$("li:first-child").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:last").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:last-child").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:nth-child(4)").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:nth-child(4n)").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:nth-child(2n+1)").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:nth-child(odd)").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:nth-child(even)").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});
$("li:only-child").css({backgroundColor:"#F44336", border:"1px dashed #303f9f", color:"#fff"});